<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>学生登录管理系统</title>
    <style>
        form{
            width: 400px;
            height: 200px;
            border: 2px black solid;
            text-align: center;
            margin: auto;
        }
    </style>
</head>
<body>
<form action="managerServlet" method="post">
    <input type="hidden" name="flag" value="login">
    <h1>学生管理系统-登录</h1>
    账号:<input type="text" name="username"><br>
    密码:<input type="password" name="password"><br>
    <input type="submit" value="登录">
</form>
</body>
</html>